Place a spoonful of drained avocado mixture in center of 6 patties; top with remaining 6 patties and seal edges together using a fork. Grill over hot coals or medium heat for about 10 minutes, turning once. Brush with reserved juices.

Insert a cooked pattie inside each pita pocket and stuff with shredded cheese and lettuce.

Please note that some ingredients and brands may not be available in every store.